<template>
  <transition name="showHeader">
    <div v-if="visible" class="header-animat">
      <a-layout-header
        v-if="visible"
        :class="[fixedHeader && 'ant-header-fixedHeader', sidebarOpened ? 'ant-header-side-opened' : 'ant-header-side-closed', ]"
        :style="{ padding: '0' }"
      >
        <div v-if="mode === 'sidemenu'" class="header">
          <a-icon
            v-if="device==='mobile'"
            class="trigger"
            :type="collapsed ? 'menu-fold' : 'menu-unfold'"
            @click="toggle"
          />
          <a-icon
            v-else
            class="trigger"
            :type="collapsed ? 'menu-unfold' : 'menu-fold'"
            @click="toggle"
          />
          <user-menu></user-menu>
        </div>
        <div v-else :class="['top-nav-header-index', theme]">
          <div class="header-index-wide">
            <div class="header-index-left">
              <logo class="top-nav-header" :show-title="device !== 'mobile'" />
              <s-menu v-if="device !== 'mobile'" mode="horizontal" :menu="menus" :theme="theme" />
              <a-icon
                v-else
                class="trigger"
                :type="collapsed ? 'menu-fold' : 'menu-unfold'"
                @click="toggle"
              />
            </div>
            <user-menu class="header-index-right"></user-menu>
          </div>
        </div>
      </a-layout-header>
    </div>
  </transition>
</template>

<script>
import UserMenu from '../tools/UserMenu'
import SMenu from '../Menu/'
import Logo from '../tools/Logo'
import { mixin } from '@/utils/mixin'

export default {
    name: 'GlobalHeader',
    components: {
        UserMenu,
        SMenu,
        Logo
    },
    mixins: [mixin],
    props: {
        mode: {
            type: String,
            // sidemenu, topmenu
            default: 'sidemenu'
        },
        menus: {
            type: Array,
            required: true
        },
        theme: {
            type: String,
            required: false,
            default: 'dark'
        },
        collapsed: {
            type: Boolean,
            required: false,
            default: false
        },
        device: {
            type: String,
            required: false,
            default: 'desktop'
        }
    },
    data() {
        return {
            visible: true,
            oldScrollTop: 0
        }
    },
    mounted() {
        document.addEventListener('scroll', this.handleScroll, { passive: true })
    },
    methods: {
        handleScroll() {
            if (!this.autoHideHeader) {
                return
            }

            const scrollTop = document.body.scrollTop + document.documentElement.scrollTop
            if (!this.ticking) {
                this.ticking = true
                requestAnimationFrame(() => {
                    if (this.oldScrollTop > scrollTop) {
                        this.visible = true
                    } else if (scrollTop > 300 && this.visible) {
                        this.visible = false
                    } else if (scrollTop < 300 && !this.visible) {
                        this.visible = true
                    }
                    this.oldScrollTop = scrollTop
                    this.ticking = false
                })
            }
        },
        toggle() {
            this.$emit('toggle')
        }
    },
    beforeDestroy() {
        document.body.removeEventListener('scroll', this.handleScroll, true)
    }
}
</script>

<style lang="less" scoped>
@import '../index.less';

.header-animat {
    position: relative;
    z-index: @ant-global-header-zindex;
}
.showHeader-enter-active {
    transition: all 0.25s ease;
}
.showHeader-leave-active {
    transition: all 0.5s ease;
}
.showHeader-enter,
.showHeader-leave-to {
    opacity: 0;
}
</style>
